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Water Mental Ray Renders

Posted: Sat Mar 13, 2010 1:04 am
by Vitor Teixeira
Hello everyone, I've started to render some of my water shapes and I'm having some problems.
I'm using a dielectric material with IBL (HDRI image).
The settings in MR are for production set but I still get this noise patterns as you can see. I've changed the multi pixel for Gauss but I don't like the effect.
What should I do?

A bigger image can be seen here:
http://img697.imageshack.us/img697/7320/59897446.jpg

Water Mental Ray Renders

Posted: Sat Mar 13, 2010 2:11 am
by lukeiamyourfather
Looks like the pixel sample is too small, try something like 8x8 instead of the default 3x3 (if I remember correctly). Its been a while since I've rendered in Maya, can't remember if they call it pixel sample or something else.

Water Mental Ray Renders

Posted: Sat Mar 13, 2010 2:41 am
by Vitor Teixeira
I already did that but it stills the same.
I lose a lot of detail when doing that.
I put the reflections on 1 and the refractions on 5. It's better but still I don't like it very much. What do you think:

Water Mental Ray Renders

Posted: Sat Mar 13, 2010 6:05 am
by lukeiamyourfather
When you say refractions you mean the index of refraction? For water it would be approximately 1.333. Higher values will cause greater distortion of refractions within the fluid. Not sure if that's what you mean or not, wish I had Maya in front of me to fiddle.

Water Mental Ray Renders

Posted: Sat Mar 13, 2010 10:33 am
by bubs
setting for production means only the antialiasing,the probleme you have is the setting in final gather,number ofRays and Radius,here is the trick:,mesur the scene with mesure node,the put the number you get in the rays and 1/10 for the radius,and go from there
cheers

Water Mental Ray Renders

Posted: Sun Mar 14, 2010 4:20 pm
by Vitor Teixeira
When you say refractions you mean the index of refraction? For water it would be approximately 1.333. Higher values will cause greater distortion of refractions within the fluid. Not sure if that's what you mean or not, wish I had Maya in front of me to fiddle.

I know that but I was talking of the raytracing settings. The index of refraction on my dielectric material is already with that value.

Bubs I'm not using FG not even GI do you think I should?

Water Mental Ray Renders

Posted: Sun Mar 14, 2010 5:16 pm
by Vitor Teixeira
http://picasaweb.google.pt/vteixeira83/FinalAnimationProjectWIP#5448539393067509634

My latest result.

Water Mental Ray Renders

Posted: Sun Mar 14, 2010 8:02 pm
by bubs
hey,rendering with IBL needs FG ,and to enhance the look,try to put some white card,to reflect on the other side,or use the same hdri maps in the reflection,also,blur the image a bit in the image menu within render attribute.

good luck
Farid

Water Mental Ray Renders

Posted: Sun Mar 14, 2010 8:08 pm
by Vitor Teixeira
use the same hdri maps in the reflection

How do I do this?
I think it's better to do all the motion blur in post.
This image took me 30 minutes to render because of the Motion Blur.
I'm using Mitchell in the render settings.

Water Mental Ray Renders

Posted: Sun Mar 14, 2010 9:07 pm
by bubs
i will put a tutorial.tomorrow,on how to enhance the look,rendering with hdri,setting white card ans so on.
hang on
cheers
Farid